10 + 10 = 20

Giai phuong trinh nghiem nguyen

a)x²-4xy=23

tim x,y nguyen duong thoa man

4xy-3(x+y)=59

Cho hinh thang ABCD(AB//CD) co CD=AD+BC goi K la diem day thuoc BC sao cho KD=AD chung minh

AK la phan giac cua goc A

KC=BC

B la phan giac cua goc B

tim x bang cach phan tich da thuc thanh nhan tu

x³-3x²+3x-1=0

Phan tich da thuc thanh nhan tu:

m³+27

\(\frac{1}{27}\)+a³

(a+b)³-c³

x⁹+1

x³+9x²+27x+27